Paper for preventing tarnishing of polished metals



Patented May 10, 1927.

UNITED STATES PATENT OFFICE.

FAY H. OSBORNE, OF WINDSOR LOCKS, CONNECTICUT, ASSIGNOR TO C. H. DEXTER& SONS, INCORPORATED, OF WINDSOR LOCKS, CONNECTICUT, A CORPORATION OFCONNECTICUT.

PAPER FOR PREVENTING TARNISHING 0F POLISHED METALS No Drawing.

The object of the present invention is to provide an improved paperwhich will effectively prevent tarnishing of polished metal articlesenclosed or wrapped therein. My improved paper will. protect the metalswrapped therein against the tarnishing, impurities, such as sulphur, ofthe atmosphere, the paper acting, so to.speak, as a filter or screen. I

The invention consists in a paper treated with zinc acetate.

1 The paper, which may be of any suitable kind, such as tissue paper,wrapping paper, kraft paper, etc., may be coated or impregnated withzinc acetate in any suitable manner and by following any desired method.For example, the paper, to which is to be given anti-tarnishingproperties, may be passed through a solution of zinc acetate, or thepaper may be dipped into the solution, or the solution may be sprayedonto the paper. The zinc acetate may be applied during the process offorming the paper, or the paper may be formed and then have the zincacetate applied thereto.

- My improved paper may be very economically produced, particularly soas the amount of zinc acetate required is relatively small and zincacetate is relatively cheap. The use of zinc acetate is particularlyadvantageous in this connectionbecause it will not affect the color ofthe paper to which it is applied, and the impurities of the air will notchange or affect the color of the paper.

I have found that white tissue paper, treat- Serial No. 75,656.

ed with zinc acetate and wrapped about silverware or other polishedmetal articles, will effectively protect, for an indefinite period oftime, the articles against tarnishing in an atmosphere which contains avery considerable amount of tarnishing impuritie; and especially a largeamount of sulphur. The zinc acetate will combine with the tarnishingimpurities of the atmosphere to form zinc salts in the paper before theimpurities get through the paper to the metal. The zinc salts, which areformed, however, do not in any Way affect the color of the paper. Forinstance, in the case of white tissue paper treated with zinc acetate,the paper does not become yellow or otherwise di: colored upon theformation of such salts.

I am aware, of course, that it is old to wrap or enclose polished metalarticles. such as silverware, in tissue and other kinds of paper, andthat it is also old to make such tissues chemically pure in that alltarnishing impurities are removed from the paper itself, but, in suchcases, the paper, although chemically pure in the sense stated, will notprotect the articles wrapped therein from the tarnishing impurities ofthe atmosphere, such impurities being able to pass through the paper.

I claim as my invention:

An article of manufacture for protecting polished metal articles againsttarnishing, consisting of paper treated with zmc acetate.

FAY H. OSBORNE.

